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Integrated QoS Management: Cooperation of Processor Capacity Reserves and Traffic Management
Yoshito TOBE Hideyuki TOKUDA
IEICE TRANSACTIONS on Communications
Publication Date: 1998/11/25
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Performance and Quality of Service (QoS) of Multimedia Networks)
Category: Media Management
QoS, operating system, multimedia, real-time system, traffic management,
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When multiple flows including continuous media streams are simultaneously sent from a computer, allocation and management of both processor capacity and network bandwidth need to be considered. We propose a framework of Quality of Service (QoS) management inside a sending host that controls execution of sending threads in consideration of utilization of processor capacity and network bandwidth. To distinguish from flows which require only best-effort service, we call a flow which requires a specific rate of service "reserved flow. " To guarantee QoS of such reserved flow both in processor- and network-intensive cases in a sending host, processor capacity reserve is allocated such that the rate of each reserved flow is attained and non-conforming data are policed before they are transmitted. Processor Capacity Manager and the network device driver exchange information in a cooperative manner to support the rate adaptive allocation of processor capacity reserve. In this paper, we describe design and implementation of our framework on RT-Mach. The results of performance evaluations demonstrate that our scheme performs well for full-duplex Ethernet.